动静组合加载条件岩爆特性及倾向性指标

来源期刊:中南大学学报(自然科学版)2014年第9期

论文作者:殷志强 李夕兵 董陇军 金解放 马海峰

文章页码:3249 - 3257

关键词:岩爆;动静组合加载;倾向指标;分离式霍布金森压杆

Key words:rockburst; coupled static and dynamic loads; proneness index; split Hopkinson pressure bar(SHPB)

摘    要:基于岩爆灾害是静载与动载共同诱发的工程事实,从动静组合加载下岩石破坏过程中能量储存和释放特征出发,充分借鉴现有岩爆倾向性指标的合理之处,提出动静组合加载下的岩爆的倾向性指标。该指标能克服现有指标只考虑静载的局部性,更能反映出岩体岩爆破坏应力峰值后的能量释放特征。选取0轴压、抗压强度的20%,60%,70%和80%共5个典型轴压水平,进行不同冲击能量下的动静组合冲击实验。通过对试验结果的分析,考察动静组合加载下的岩爆特性及倾向性指标方法。研究结果表明,新指标能够较好反映岩石的岩爆倾向性。通过分析比较,进而提出动静组合加载下岩爆倾向性指标判据的初步建议。根据该建议指标可以反映出激励性岩爆的发生受静载和动载2种因素的综合作用。

Abstract: Based on the rockburst mechanism of coupled static and dynamic loads and the energy characteristics of storage and release during rock failure process, and the rationality of several existing rockburst proneness indices, a new rockburst proneness index under coupled static and dynamic loads is proposed. This index avoids the one-sidedness and difference of index, and can reflect the character of energy release (when the curve after the stress peak of rockburst failure proceeding. Five cases, without axial pre-compressive stress and with four levels (in accordance with the static load strength of 20%, 60%, 70% and 80% in 4 series) of axial pre-compressive stress were designed to conduct impact tests with different incident energy. By analysing the testing result, the rockburst characteristics and proneness index under coupled static and dynamic loads were discussed. The results show that this new index is verified to be able to show fairly well the rockburst proneness. Finally, a criterion of rockburst proneness is put forward. This new index reflects the interaction of static and dynamic loads on the impellent rockburst.

相关论文

  • 暂无!

相关知识点

  • 暂无!

有色金属在线官网  |   会议  |   在线投稿  |   购买纸书  |   科技图书馆

中南大学出版社 技术支持 版权声明   电话:0731-88830515 88830516   传真:0731-88710482   Email:administrator@cnnmol.com

互联网出版许可证:(署)网出证(京)字第342号   京ICP备17050991号-6      京公网安备11010802042557号